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ABSTRACT This research addresses the stability of bioapatite and collagen fractions of AMS dated steppe bison (Bison priscus) teeth.Through the course of other research, 8 prehistoric bison molars were submitted for AMS dating of...Radiocarbon dating of solvent-extractable, short-chain (CC=−298‰ to −712‰).Furthermore, the radiocarbon ages of these fatty acids progressively increase with the core depth.Existing radiocarbon (14C) dates on American mastodon (Mammut americanum) fossils from eastern Beringia (Alaska and Yukon) have been interpreted as evidence they inhabited the Arctic and Subarctic during Pleistocene full-glacial times...more Existing radiocarbon (14C) dates on American mastodon (Mammutamericanum) fossils from eastern Beringia (Alaska and Yukon) have been interpreted as evidence they inhabited the Arctic and Subarctic during Pleistocene full-glacial times (∼18,000 14C years B. However, this chronology is inconsistent with inferred habitatpreferences of mastodons and correlative paleoecological evidence. americium regionally, we obtained 53 new 14C dates on 36 fossils,including specimens with previously published dates. Some erroneously “young” 14C dates are due to contamination by exogenous carbon from natural sources and conservation treatments used in museums.The results of analyses have shown that 14C ages of bioapatite fraction arerejuvenated as a result of isotopic exchange with the younger carbon from the soil solutions.The datingof bioapatite from the samples collected in the boreal climate of Alaska is possible only with a certain correctionfor the isotope fractionation.
Radiocarbon reservoir effects in archaeology not linked with aquatic food resources will also be considered.
The 14C age of the samples varied across age ranges between 17,360 ± 50 and 43,370 ± 300 noncalibratedyears BP.